There are 2 sizes.  The original size which is 1 7/8" and the size you get if 
you order a new one because someone chisselled the old one off which is 
smaller at 1 3/4".
I don't think a 2 1/8" would fit inside the hub etc.
Daniel1312
In a message dated 19/06/03 09:33:22 Pacific Daylight Time, 
cciaffone@earthlink.net writes:
> Hmmm -- got 2 different answers so far: 1 7/8" and 2 1/8".
> 
> I'm hoping it's 1 7/8 'cause I have that socket. Maybe year
> makes a diff? Mine is a '72.
> 
> chuck
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